Easy to create the account, and the average user will never figure it out without help as long as you are very careful. FB will know, Google will know, Twitter will know, most other social and very useful apps will 'know' but the question is whether they care. They don't, at least not unless you let it rip with truly non PC/PG content. That might get the persona profile reported, investigated and banned.

As an experiment, I once created a profile to see how many new friends I could insert into my dreary life within 24 hours. During this period I made a res run to Spar, had a few snacks and probably too much wine, and slept for 5 hours but still ended up with 647 new friends when I stopped the clock at 22 hours, just when the exponential effect truly kicked in. (Disclaimer: this was an ill-advised experiment, I had probably had too much of the good stuff which forced me into this rash decision, I bitterly repent my actions and reject the very notion of breaking FB's TOS. When I came to my senses I promptly deleted the account and will not ever again engage in such behavior in future, nor will I encourage others to do so.